Drilling jar and method of making same



Sept. 7 ,1926. w 4 1,599,086 E. E. GREVE v DRILLING JAR AHD METHOD OF MAKING SAME Filed Jan. 8, 1925 [NV TOR.

ATTORNEY.

atingcertain fishing tools, and. the like.

Patented Sept- 7, 1926.

A ITED T ns ram orator...

s EDGAR" Eiennvn, -QF;'-BELLEVUE, PENNSYlZViAN-IA.

I Y DRILLING. JAR. AND METHOD .QFMAKING ,sAME.

,; Ap p 1ica tio n filed. January 85,1925} Serial a... 1,213.

This inyention, relates to the manufacture and construction of drill ng jars. 1 v i .Drillingjarsare used 'n the operation of drilling oil-and gaswells and similar operations g for the purpose: of transmitting blows or jars to a partofthe drill string below. thejars for the purpose of loosening tools which may haveybecome stuck,,or for opercooperate .with the corresponding extension Gil of; the; other, part, the extensions being interlinkedin much the csame manner as two links of a; chain. I This connection permits of a limited relative longitudinal movement and a moviement which is free. and with little resistance, whereby a blow of maximum intensity can be struck by; the upper part sliding or dropping onto the lower part.

Jars receive such severe treatment, however, that great difficulty has been experienced in .endeavoringto furnish the oper ator with a jar sufficiently indestructible to give the requisite satisfaction. In order to get the proper clearance and free movement, it has beennecessary to resort to welding certain parts of the jars, or'it has. been necessary to out both jars, interfitted for use,

from a solid billet ofmetal without anywelding.

In the former case, the reins of both parts have been welded to the respectiveparts, and such method of forming the jars has not been'satisfactory, though relatively cheap.

On the other hand, it is an extremely expensive process to manufacture the interconnected jars from a singlepiece of metal.

The present invention has for its object to provide a method of forming a set of jars wherein there will be but one weld, and that so made as to be for all purposes the equivalent of a jar without welds.

A further object of the invention is to provide a set of jars which may be cheaply manufactured, but, which will be as strong for. all purposes as the non-welded jars cut from a single billet.

Each. part has a slotted The invention may. bereadilyunderstood by reference tothe accompanying drawings, in which: i i i I I Fig. l is a side elevation of a set of jars, similar to those now in use, but formed in accordance with my invention;

Fig. 2 represents thepin or upper mom berof thejars at the completion of thefirst stage of its formation;

Fig. 3 represents a. further development of the part. shown in Fig. 2. I Inthe drawings, Zdesignates the pin end of the upper jar, and. 3 is the pin or tapered;

threaded connecting. stud. itself. The body 2 has. a squared portion A to whichv a. wrench may be applied. Extendingdown from the body are reins 5, which are connected at 6 at their lowermost ends.

. The box or lower. part of' the jars is, designated? and has athreaded recess or box I.

S therein. At 9 is a squared surface corresponding to 4 onmember 2, and the reins aredesignated 10. The cross connectionat the end of reins 10 isdesignated 11;

Re'ins 5 and 10 are at right angles other as arethe cross connections 6 and ll.

'VVitli this arrangement, it will be seen that one member may be raised and lowered with considerable freedom of movement with respect to the other. The general arrangement, in so far as it has already been described, is that obtaining in present forms of ars. 1

According to the present invention,the box or lower end part, together with the reins, will be formed from a single piece of metal without any welding, the whole thing being formed as an integral unit. The manner of doing thisby forging, machining, etc.,

. will be readily understood by those skilled in the art.

In the manufacture of the pin member of the jar, a strip of metal is forged or worked to a suitable shape, after which one end of it is passed between the reins 10 of the box member. The two ends of the strip are then brought together, as shown in Fig. 2, and welded along the contacting faces at a.

After being welded, as in Fig. 2, the square part 4 is formed, preferably by forging, and the pin 3 turned down and then threaded. Fig. 8 shows the construction before threading the pin. At a suitable time, the loop of the flank may be shaped to the final position shown in Fig. 1. This, of course, couldbe to each iii) done before or after the turned.

In Fig. 1, I have shown how the jar is connected in a drill string. In every case,the pin 3 will'be received in the box 17 (shown in dotted lines in Fig. l) of a suitable connecting element. As thus arranged, the box 17 will confine the welded end of the upper part of the jar against spreading, as it would be necessary to split part 17 to open the weld.

Furthermore, the weld lies along the longitudinal axis of the tool so that the pull is equally distributed, and there is no force acting to spread the weld.

In order to eliminate any possibility of shearing at the weld, due to the jars becoming bent in operation, an insert or key 12 of a non-uniform center may be incorporated at the welded joint.

lVhile I have illustrated a preferred method and embodiment, it will be understood that departures and changes are within the contemplation of the invention.

I claim as my invention:

1. The method of making two-part drilling jars which consists in forming one part with an elongated loop, passing a strip through the loop, and folding the ends to gether, securing the contacting faces of the ends, and forming a pin connection at the extremity of the united ends.

2. The method of making a two-part drilling jar which consists in forming a box member with an elongated loop, passing a strip through the loop and folding the ends together, welding the contacting faces of the pin 3 has been ends in line with the longitudinal axis of the bar, and then forming a pin connection on the welded extremity of the end of the member thus formed and shaping the loop for cooperation with the loop of the first memher. 7 t V The method of makinga two-part drilling jar which consists in forming an integral box member with an elongated loop from a solid piece ofmetal, passing a strip through the loop and folding the ends together, welding the abutting ends, and subsequently shaping the loop formed by welding the ends of the strip together, shaping a wrench surface thereon and machining a pin on the extremity of the joined ends.

A jar comprised of a box member having an elongated loop at its upper end, and a pin member comprising integral reins and a longitudinal split body integral with the upper ends of the reins, the split sections of the body being welded together, and a pin at the upper end of the body integral with each of the reins. W Y

5. A jar comprised of a box member having an elongated loop at its upper end, and a pin member comprising integral reins and a longitudinal split body integral with the upper ends ot the reins, the split sections of the body being welded together, an insert be tween the two welded surfaces of the split body, and a pin at the upper end of the body integral with each of the reins.

In testimony whereof I aflix my signature.

EDGAR E. GREVE. 

